//
//  WBNewFeatureView.swift
//  传智微博
//
//  Created by zhoujiming on 2017/2/10.
//  Copyright © 2017年 gmcc. All rights reserved.
//

import UIKit

// 新特性视图
class WBNewFeatureView: UIView {

    
    @IBOutlet weak var scrollView: UIScrollView!
    
    @IBOutlet weak var enterButton: UIButton!
    
    @IBOutlet weak var pageControl: UIPageControl!
    
    
    @IBAction func enterStatus() {
        removeFromSuperview()
    }
    
    
    
    class func newFeatureView()->WBNewFeatureView{
        
        let nib = UINib(nibName: "WBNewFeatureView", bundle: nil)
        
        let v = nib.instantiate(withOwner: nil, options: nil)[0] as! WBNewFeatureView
        
        v.frame = UIScreen.main.bounds
        return v
    }
    
    override func awakeFromNib() {
        // 添加4个图像视图
        let count = 4
        
        let rect = UIScreen.main.bounds
        
        for i in 0..<count {
            let imageName = "new_feature_\(i+1)"
            let iv = UIImageView(image: UIImage(named: imageName))
            
            
            // 设置大小
            iv.frame = rect.offsetBy(dx: CGFloat(i)*rect.width, dy: 0)
            scrollView.addSubview(iv)
            
            // 指定scrollView的属性
            scrollView.contentSize = CGSize(width: CGFloat(count+1) * rect.width, height: rect.height)
            
            scrollView.bounces = false
            scrollView.isPagingEnabled = true
            scrollView.showsVerticalScrollIndicator = false
            scrollView.showsHorizontalScrollIndicator = false
            
            scrollView.delegate = self
            
            enterButton.isHidden = true
        }
    }
}

extension WBNewFeatureView: UIScrollViewDelegate{
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        // 滚动到最后一瓶，让视图删除
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width)
        
        // 判断是否最后一页
        if page == scrollView.subviews.count {
            removeFromSuperview()
        }
        
        // 如果倒数第二页，显示按钮
        enterButton.isHidden = ( page != scrollView.subviews.count - 1)
    
    }
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        // 一旦滚动，隐藏按钮
        enterButton.isHidden = true
        // 1. 计算当前的便宜量
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width + 0.5)
        
        // 设置分页control
        pageControl.currentPage = page
        
        // 分页空间的隐藏
        pageControl.isHidden = (page == scrollView.subviews.count)
    }
}
